package com.ihr360.job.core.support;

import org.springframework.core.annotation.AnnotationUtils;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;

/**
 * Provides reflection based utilities for Spring Batch that are not available
 * via Spring Core
 *
 * @author Michael Minella
 * @since 2.2.6
 */
public class ReflectionUtils {

    private ReflectionUtils() {}

    /**
     * Returns a {@link java.util.Set} of {@link java.lang.reflect.Method} instances that
     * are annotated with the annotation provided.
     *
     * @param clazz The class to search for a method with the given annotation type
     * @param annotationType The type of annotation to look for
     * @return a set of {@link java.lang.reflect.Method} instances if any are found, an empty set if not.
     */
    public static final Set<Method> findMethod(Class clazz, Class<? extends Annotation> annotationType) {

        Method [] declaredMethods = org.springframework.util.ReflectionUtils.getAllDeclaredMethods(clazz);
        Set<Method> results = new HashSet<Method>();

        for (Method curMethod : declaredMethods) {
            Annotation annotation = AnnotationUtils.findAnnotation(curMethod, annotationType);

            if(annotation != null) {
                results.add(curMethod);
            }
        }

        return results;
    }
}